Eryk Sun added the comment:
0xC0000409 (3221226505) is STATUS_STACK_BUFFER_OVERRUN due to the CRT calling
__fastfail(FAST_FAIL_FATAL_APP_EXIT) in abort(). This is expected behavior in
Windows 8+ [1].
Initially I couldn't reproduce this error because Python found the standard
library from the system Python via the registry. After archiving (as .reg) and
removing the key "HKLM\SOFTWARE\Python\PythonCore\3.5", I reproduced the
problem as follows:
C:\Temp>myenv\Scripts\python.exe -Im ensurepip --upgrade --default-pip
Fatal Python error: Py_Initialize: unable to load the file system codec
ImportError: No module named 'encodings'
Current thread 0x00000b9c (most recent call first):
venv didn't copy over python35.zip to the Scripts directory. I don't know
whether there's ever a legitimate reason to look for and copy a zipped standard
library, or whether venv is only supported for use with a standard Python
installation.
I don't recommend doing this, but if you create the environment --without-pip,
the command 'succeeds'. Then you'll have to manually copy python35.zip to
Scripts and obtain activate.bat (edit this) and deactivate.bat from another
install or the web. You still won't have ensurepip. If you want pip and
setuptools, use get-pip.py from the web. This is all probably more trouble than
you want. However, the embedding distribution is not intended to be a full
Python installation that's suitable for development.
[1]: https://msdn.microsoft.com/en-us/library/dn774154
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nosy: +eryksun
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